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RC Circuits

RC Circuits. Switches. A circuit can be open or closed. Different states at different times A switch controls whether a circuit is open or closed. The schematic symbol is an angled line showing a break in the circuit. A capacitor stores charge. Related to voltage Q = CV V = Q/C

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RC Circuits

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  1. RC Circuits

  2. Switches • A circuit can be open or closed. • Different states at different times • A switch controls whether a circuit is open or closed. • The schematic symbol is an angled line showing a break in the circuit.

  3. A capacitor stores charge. Related to voltage Q = CV V = Q/C A switch can be used to complete a circuit with a resistor. Current in circuit Decreases as charge is removed Capacitor Discharge I(t) C R

  4. The voltage and current in a discharging capacitor falls with time. Fractional change is the same Never reaches zero The period of time for a decrease by a factor of e is the time constant t. Time Constant

  5. The discharge of a capacitor can be represented by an exponential curve. Depends on initial voltage Exponential Decay

  6. A capacitor in a circuit behaves like a voltage source. V = Q/C Depends on time A loop with a capacitor follows Kirchhoff’s voltage law. Capacitor Loop I C R

  7. A battery can be used to charge a capacitor. Includes resistance The circuit forms one loop. The capacitor approaches a maximum voltage. V = Q/C Charging Up I(t) R V C

  8. Charge and Discharge • The curves for charging voltage increases while the current decreases. • When potentials match there is no current.

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